What are the beneficial features of a car security system? First you have the obvious attention-getting alarm noise. You can set this off from your keychain at any time in order to draw eyes and scare off predators.  Secondly, most car security systems have simple driver's side door access. You thumb the UNLOCK button once and it only unlocks the driver's door, hence leaving you less vulnerable. Then there's the remote start feature. You can literally start your vehicle's engine as you approach it. All while keeping it on lock-down. This makes for a speedy getaway. Other features you may enjoy are sensor alarms and noise alarms. If you have a convertible, the top can be left down and still secured. If someone reaches inside, the car security alarm will sound. If a window is shattered, the alarm system will activate and scream to draw attention.